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Low
Viscosity Polyurethane Gel Casting System

(Product Code: GK-7)

Prepolymer (Part-A): MPG-023Curative
(Part-B): PNC-153

This material is
formulated for production of thin polyurethane gel film or parts.The low viscosity property of the mixed component
enables the user to cast this into a thin layer without entrapping a significant amount
of air.This product can be cast in
between films, molded in vertical mold, or cast on an open surface to make
thin gel sheets.It is room-temperature-cure
liquid castable system that can be processed without use of heat.

The suitable
applications include custom gel sheets, tack pads, vibration dampening parts,
and encapsulation of electric components.It is also suitable for many other custom applications where flexibility
and some strength of the gel sheets or parts are required.

This material is not suitable
for pouch filling application.We
recommend MPP-V37A for pouch filling application where the material needs to
cure within film encapsulation.

GK-7 (Low Viscosity
Polyurethane Gel for Films and Sheets)

Part-A:

MPG-023

Part-B:

PNC-153

Mixing
ratio:

A:B

=

1: 10.00

by volume

A:B

=

1: 9.216

by weight

(This
is a variable-ratio system, which the user can change the mixing ratio to
control the softness of the material.Increasing part-B ratio yields a softer gel material.)

Processing
Temperature:

Part-A:

Ambient

Part-B:

Ambient

Mold:

Ambient

Curing Pattern

Pot Life:

8-10
munites

Demolding
Time:

8 hours

Complete
Cure:

3 - 4days

(The curing pattern can be modification by use of heat
and catalyst variation.)

Part-A material has
isocyanate material, which is highly moisture sensitive.Blanket the space in the container with dry
nitrogen gas after the
containers are opened.Please refer to
the enclosed MSDS for the details on safety and handling the materials.

The part-A component material
could freeze at temperature slightly below room temperature.If you see gel-like consistency within the part-A
container, the material might have been frozen during the transportation or
storage.Heat part-A
to 140 – 160 °F to thaw.Then the
component material should be stored at room temperature 70 – 90°F.

Properties of the
components

Part-A

Product Code:

MPG-023

Description:

Isocyanate terminated
prepolymer extended with polyester polyol

%NCO:

18.6% (+/- 0.5)

Amine Equivalent

225.9

Specific Gravity:

1.112

PhysicalState at 25 °C ( 77 °F):

Liquid

Viscosity at 25 °C (77 °F):

1200 cps (+/- 200)

Storage:

Store in a dry indoor
storage at room temperature.The
material is highly sensitive to moisture.After using the content, immediately inject dry nitrogen gas or -40°
due-point dry air into the container to blanket the material then store.

It freezes just below room temperature. Storage
temperature should be between 70 - 90 F. It can freeze during shipping
in cold seasons. The material needs to be thawed immediately after
receipt following the specific thawing instructions to avoid deterioration.Heat will accelerate the subsequent
reaction within the material and shorten the shelf life of the material. Do
not store at an elevated temperature.

Part-B

Product Code:

PNC-153

Description:

Curing agent based on a
blend of polyols and additives

OH number:

1532

Equivalent Weight:

15 – 1630

Specific Gravity:

1.104

PhysicalState at 25 °C ( 77 °F):

Liquid with slight haze

Viscosity at 25 °C (77 °F):

900 cps (+/- 300)

Storage:

Store in a dry indoor storage
at room temperature.The material is
hygroscopic. For long-term storage, inject dry nitrogen gas or -40° due-point
dry air into the container to blanket the material.

Handling

Information:

Storage:

Part-A component
(prepolymer) contains isocyanate component, which is very much sensitive to
moisture.If it is left in air, part-A
will react with atmospheric moisture and will be ruined.This reaction is non-reversible.Soon after opening a can and dispensing the
content, nitrogen gas or negative-40-degree-due-point dry air needs to be
injected to the can to blanket the material.Silica gel or calcium chloride desiccant filter should be installed to
55 gallon drum-vent for your drum feeding system.The storage temperature should be at a room
temperature between 65 and 80 ºF.

Part-B
component is hygroscopic.If the
material is exposed to ambient air, it may absorb moisture. Moisture
contaminated part-B material may become source of degradation or excessive
bubbles in the product. Avoid exposure of the material to air.Purging the empty space in the container with
nitrogen gas or negative-40-degree-due-point dry air is also recommended to
prevent moisture contamination of part-B as well; however most of the cases,
keeping in an airtight container will be sufficient. Store it in a dry indoor
storage at a room temperature between 65 and 85 ºF. The moisture contamination
of part-B material is reversible.By
heating material to 160 - 180 ºF and vacuuming it at about 29" Hg negative
pressure for several hours will reduce the moisture level.

Safety:

The component
materials are industrial-grade chemicals.Please keep them in a secure place and prevent access from any
unauthorized individual.The personnel who
handle these materials need to read the Material Safety Data Sheet (MSDS) for
detail information on safety and handling of the material.The MSDS for each component is sent with the
shipment of the material.

When using
this material, be sure to operate in a wide-open area with good air movement,
or in a well-ventilated area. Wear rubber gloves, long sleeves, and protective
eyeglasses to prevent skin/eye contact of the material.When your operation involves heating or
spraying of the material, we recommend, in addition to the above, installation
of a proper ventilation system and/or using an appropriate type of respirator
to prevent inhalation of the fume.

Direct
contact of polyurethane raw materials to skin/eye, as well as ingestion may
lead to health problems.No eating or
smoking should be permitted at the working area.The operator should wash hands well with soap
and water after handling the materials and follow the other procedures of the
Standard Industrial Hygiene Practices.Please refer to the MSDS for each component for the detailed health
information.

Notice:
All of the statements, recommendations, suggestions, and data concerning the
subject material are based on our laboratory results, and although we believe
the same to be reliable, we expressly do not represent, warrant, or guarantee
the accuracy, completeness, or reliability of same, or the material or the
results to be obtained from the use thereof, neither do we warrant that any
such use, either alone or in combination with other materials, shall be free of
the rightful claim of any third party by way of INFRINGEMENT or the like, and
NORTHSTAR POLYMERS DISCLAIMS ALL
WARRANTIES, EXPRESS OR IMPLIED, OF MERCHANTABILITY and FITNESS FOR A PARTICULAR
PURPOSE.